ELECTRO OPTICAL SIGNAL PROCESSING TECHNIQUES FOR PHASED ARRAY ANTENNAS
Abstract
The investigation of array antenna electrooptical signal processors continues with emphasis placed on the development of a wide-band solid light modulator. The light modulator bandwidth and the transfer characteristics between input voltage and peak phase deviation of light wave front are obtained experimentally for fused silica light modulators operating in the compression mode. Transfer characteristics are found to be linear as predicted by theory, and bandwidth is found to be greater than 50 per cent of resonant transducer frequency. Electromechanical cross coupling and ultrasonic beam broadening are investigated for both the shear and compression modes by means of Schlieren techniques. Results show that in a multi-channel configuration, adjacent light modulator channels may be spaced by one transducer width without adverse effects. First order diffraction patterns are obtained for the fused silica light modulator. Results are consistent with theory showing that no optical distortion is introduced by ultrasonic propagation in fused silica.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 03, 1966
- Accession Number
- AD0800923
Entities
People
- J. Minkoff
- M. Arm
- N. Wyman
- S. Bernstein
Organizations
- Columbia University